Increase data node volume

The method for increasing data node volume is as follows.

Increase data volume

1. In the KakaoCloud console > Beyond Compute Service > Virtual Machine > Volume, create a volume.

2. Attach the created volume to an instance.

3. Access the instance via SSH.

   Mount the added volume to the system

   sudo mkfs -t xfs /dev/vdb
   sudo mkdir -p /data/vdb
   sudo mount /dev/vdb /data/vdb
   sudo chown ubuntu:ubuntu /data
   sudo chown ubuntu:ubuntu /data/vdb
   
   ubuntu@host-10-182-101-5:~$ df -h
   Filesystem      Size  Used Avail Use% Mounted on
   udev             32G     0   32G   0% /dev
   tmpfs           6.3G  700K  6.3G   1% /run
   /dev/vda1        97G   21G   76G  22% /
   tmpfs            32G     0   32G   0% /dev/shm
   tmpfs           5.0M     0  5.0M   0% /run/lock
   tmpfs            32G     0   32G   0% /sys/fs/cgroup
   /dev/vda15      105M  3.6M  101M   4% /boot/efi
   /dev/vdb        500G  543M  500G   1% /data/vdb
   tmpfs           6.3G     0  6.3G   0% /run/user/1000
   
   Add the mounted volume to /etc/fstab

   sudo lsblk -o +UUID

4. Modify data node information.

   Add path to dfs.datanode.data.dir in /etc/hadoop/conf/hdfs-site.xml

   <property>
      <name>dfs.datanode.data.dir</name>
      <value>/hadoop/hdfs/data,/data/vdb</value>
   </property>

5. Restart the data node.